Tq... but, not that good la. I need to pull the trigger and release it quickly. The spindle keep spinning due to the inertia, and it tighten the screw.
I still can pull the trigger delicately enough NOT to invoke the impact mechanism, and stop accordingly, just like what the powered screw driver.
But, we are human and we may make mistakes... That's why, an advanced impact driver has several modes to suit the needs. No need to say, it's cost.....

Added on May 21, 2012, 1:27 pmYes, threre are more appropriate power tools for this task. The Makita DF030 or simalar drill driver with CLUTCH, which limits the torque accordingly, preventing any damages.
We can still use the impact driver for delicate tasks, but use the varible speed control trigger wiesely.. If you don't any confident, don't use impact driver, and use the drill driver instead or,... hand tools such as the screw driver.

The electronic appliance, Sony DPS M7 which I showed has 15 screws, and twisting the screw driver is quite tiresome for 'old' person like me.

Beside the appliance, I also use the impact driver to dissamble front loading washing machine, and has .... many screws to deal with.
Just get what JinXXX have. Combo set with drill and impact. Can cover every expect of drilling. Good price too.